FAQ: Strategies for Complex State - Immutable Updates & Complex State

This community-built FAQ covers the “Immutable Updates & Complex State” exercise from the lesson “Strategies for Complex State”.

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This exercise can be found in the following Codecademy content:

Learn Redux

FAQs on the exercise Immutable Updates & Complex State

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Can someone help me to go deeper or explain what exactly all the code is doing?
I can answer these three problem with the help of hint, but actually I can’t understand what’s happening and the main idea in this section

thanks in advance